Drawing press



Dec. 1924. 1,519,552

J. J. RIGBY DRAWING PRESS Filed June 26, 1923 2 Sheets-Sheet 2 ByAttorneys Patented Dec. 16, 1924.

UNITED STATES JOHN J. RIGBY, F BROOKLYN, NEW YORK.

DRAWING PRESS.

Application filed June 26,

To all whomt't may concern:

Be it known that 1, JOHN J. RIGBY, a citizen of the United States ofAmerica, residing in the borough of Brooklyn, city and State of NewYork, have invented certain new and useful Improvements in DrawingPresses, of which the following is a specification.

This invention relates to drawing presses of the type in which the blankto be drawn is gripped between a yielding blank-holder and a tool on amovable slide, and aims to provide in'rn'ovements therein.

The invention provides a press of the type referred to in which theresistance to the movement of the blank-holder is uniform or constantthroughout its movement, and in which the constant resistance may beregulated so as to be greater or less to suit the character of thedrawing to be done. According to the invention, frictional means areprovided for resisting the movement of the blank-holder, instead ofelastic means heretofore generally employed.

The invention further provides a novel combination of elementsconstituting a press of the character described, including frictionalmeans for resisting the movement of the blank-holder.

An embodiment of the invention is illustrated in the accompanyingdrawings, in which- Figure 1 is a view in side elevation, partly insection, of a press embodying my in vention.

Fig. 2 is a vertical section, running from side to side of the press,and on the line 11-11, Fi 3.

Fig. 3 is a view, mostly in plan, looking from the level indicated bythe line 111- 111, Fig.

Fig. 41 is a sectional view on the line 1VIV, Fig. 3.

Fig. is av vertical sectional view illustrating a modification of thesuspension means shown in Figs. 1 and 2.

Referring to said drawings, numeral 10 indicates a forming tool carriedby a reciprocatory slide 12, and adapted to coact with a complementaryforming tool seated upon the bolster plate 17 of the press. he tool 10and its slide 12 may be reciprocated in any suitable manner, as by meansof a crank-shaft 20 through a pitman connection 21.

Numeral designates a yielding blank- 1923. Serial No. 647,808.

holder, adapted to coact with the reciprocatory forming tool to grip themargin of a blank X (Fig. during the drawing of said blank by thecoaction of the drawing tools 10 and 15.

Friction means are provided for resisting the movement of theblank-holder by the said tool 10. These means are adapted to oppose asubstantially uniform or constant resistance to the movement of saidblank-holder by the said tool 10.

The friction means 30 preferably consists of one or more slides 32, andmeans for clamping or frictionally pressing upon said slide or slides.

The means for clamping the slide or slides 32 conveniently consists of asupport 34 for said slides, and a clam ping plate 36, adapted to bedrawn towards said support 34 by means of screws 38 or like, therebyclamping said slides 32 between the support 3 1 and the clamping plate36, and thereby preventing movement of said slides 32, except under theaction of a considerable force sufficient to overcome the frictionalcontact or binding force of said parts 34: and 36 on said slides 32.

1t has been found in practice to give greater uniformity of resistanceto have the clamping plate 36, or said plate 36 and the support 34, bearupon said slides 32 through rollers 10 or rollers 10, 411. 1n such casea greater or less part of the friction is transmitted to the bearings ofthe rollers, which in the present instance are pins or shafts 44 passingthrough said rollers and supported in suitable holes drilled in saidsupport 3 1 and plate 36.

In order to attain a fine adjustment of the clamping force of the plate36 on the slides 32, it has been fount desirable to pro vide stops 18between the said plate 36 and the support 34:. These stops 18 arepreferably screw-threaded, and the fine adjustment of the clamping plateis effected by turning the threaded stops a8 in such manner as to takeoil from the slides 32 some of the pressure exerted thereonby the screws38, and transmitted thereto by the said clamping plate 1t will beunderstood that the clamping force acting on the slides 32, and hencethe amount of resistance to the movement of said slides may be adjustedso as to be greater or less, by turning the screws 38. After thisprimary adjustment has been obmovement of said blank-holder, saidfriction means comprising a slide and means for clamping said slide,said clamping means comprising a pair of rollers bearing upon saidslide.

6. A drawing press comprising a yielding blank-holder, a reciprocatorytool adapted to grip the margin of a blank between said blank-holder andtool for drawing the blank, and friction means for resisting themovement of said blank-holder, said friction means comprising a slideand means for clamping said slide, and a Wedge piece bearing against theend of said slide adapted to be driven by said blank-holder.

7. A drawing press comprising a yielding blank-holder, a reciprocatoryto-ol adapted to grip the margin of a blank between said blank-holderand tool for drawing the blank, friction means for resisting themovement of said blank-holder, said friction means comprising a slideand means for clamping said slide, said clamping means comprising aroller bearing upon said slide, and a Wedge piece bearing against theend of said slide adapted to be driven by said blank-holder.

8. A drawing press comprising a yielding blank-holder, a reciprocatorytool adapted to grip the margin of a blank between said blank-holder andtool for drawing the blank, friction means for resisting the movement ofsaid blank-holder, said friction means comprising a slide and means forclamping said slide, and means for resetting said slide.

9. A drawing press comprising a yielding blank-holder, a reciprocatoryto-ol adapted to grip the margin of a blank between said blank-holderand tool for drawing the blank, and friction means for resisting themovement of said blank-holder, said friction means comprising a slideand means for clamping said slide, and means for reset-ting said slide,said means comprising a part actuated by said reciprocatory part.

10. A drawing press comprising a yielding blank-holder, a reciprocatorytool adapted to grip the margin of a blank between said blank-holder andtool for drawing the blank, and friction means for resisting themovement of said blank-holder, said friction means comprising a slideand means for clamping said slide, and means for resetting said slide,said means comprising a reciprocatory part having an incline forengaging the said slide and pushing it in the reverse direction to thepush of said wedge.

11. A drawing press comprising a yielding blank-holder, a reciprocatorytool adapted to grip the margin of a blank between said blank-holder andtool for drawing the blank, friction means for resisting the move mentof said blank-holder, and means for varying the amount of resistance ofsaid friction means, said latter means comprising a clamping device, andmeans for partly counteracting the clamping effect of said clampingdevice, to obtain a line adjustment of the latter.

In witness whereof, I have hereunto signed my name.

JOHN J. RIGBY.

